nlwiki Red article links w/ rare title suffixes between parenthesis

This query is marked as a draft This query has been published by Bdijkstra.

(just suffixes w/ lowercase letters for now)
1. count all suffixes in article links
2. get red article links with a suffix
3. join and select rare suffixes (currently: that occur only once)

takes 15-20 mins

https://nl.wikipedia.org/wiki/Gebruiker:Bdijkstra/quarry/Haakjesanomalieën

SQL

SELECT `suffix`, `count`, page_title AS `from`, GROUP_CONCAT(pl_title) AS `to`
FROM (
	SELECT page_title, pl_title, REGEXP_REPLACE(pl_title, '^.*_\\(([^\\(\\)]+)\\)$', '\\1') AS `suffix`, COUNT(*) AS `count`
	FROM pagelinks INNER JOIN page ON pl_from=page_id
	WHERE
		pl_from_namespace=0 AND pl_namespace=0 AND pl_title REGEXP '_\\([\\p{Ll}_]+\\)$'
	GROUP BY `suffix`
	LIMIT 1000
) t
NOT EXISTS (SELECT * FROM page WHERE pl_title=page_title AND page_namespace=0)
AND `count`=1
LIMIT 500

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